One example of the latter approach is a five-dimensional gravity model coupled to a scalar field with a non-trivial potential [1]}. In this model, the conformal invariance breaks even at zero temperature by coupling a scalar field at pure gravity in AdS, which duals to a CFT deformed by a source \(\Lambda \)  for a dimension-three operator. This source breaks the scale invariance of the resulting four-dimensional strongly coupled gauge theory explicitly and triggers a non-trivial renormalization Group (RG) flow from an ultraviolet (UV) fixed point to an infrared (IR) fixed point.
The UV fixed point assured that we are in the regime where the holographic duality is best understood and the bulk metric is asymptotically AdS. The IR fixed point is needed to guarantees that the solutions are regular in the interior and the zero-temperature solution is smooth in the deep IR. This simple model has been used to study different properties such as thermodynamics and relaxation channels [1]}, jet energy lost [3]}, and entanglement entropy [4]}.
